Method and Apparatus for Transmitting and Receiving Uplink Data

1. A method for operating a user equipment (UE) in a wireless communication system, the method comprising: receiving, from a base station, downlink control channel information; receiving, according to an indication of the downlink control channel information, an uplink data transmission grant message transmitted to the UE; extracting a first uplink delay (UL delay) parameter from a Media Access control (MAC) header of the uplink data transmission grant message, wherein the first UL delay parameter is a UL delay parameter closest to a random access preamble ID (RAPID) matched with a preamble transmitted by the UE in the MAC header; determining, according to a time unit index n and the first UL delay parameter, a time to transmit uplink data by the UE; and transmitting the uplink data according to the determined transmission time, wherein the n is a time unit index of the uplink data transmission grant message or a time unit index of the downlink control channel information.

2. The method of claim 1 , wherein, the uplink data transmission grant message is a random access response (RAR) grant message, and the uplink data is an Msg3 in a random access process of the UE.

3. The method of claim 2 , wherein, when the UE extracts the first UL delay parameter from the downlink control channel information, the step of receiving the downlink control channel information and extracting the first UL delay parameter from the downlink control channel information comprises: after the UE detects a downlink control channel by using its own Random Access Radio Network Temporary Identity (RA-RNTI), deciding whether an RAR corresponding to the downlink control channel comprises the RAPID matched with the preamble transmitted by the UE itself; if so, extracting the first UL delay parameter from this downlink control channel; and if not, continuously detecting other downlink control channels until a downlink control channel comprising the RAPID matched with the preamble transmitted by the UE itself is found and extracting the first UL delay parameter from the corresponding downlink control channel; or stopping searching and preparing for transmission of a new random access signal according to a higher-layer indication; or continuously searching until a random access detection window ends.

4. The method of claim 2 , wherein, when the UE extracts the first UL delay parameter from the MAC header of the RAR grant message, the step of extracting the first UL delay parameter comprises: successively reading all MAC subheaders in the MAC header of the RAR message; upon reading the RAPID matched with a preamble transmitted by the UE, using the first UL delay parameter closest to the matched RAPID, among previously read first UL delay parameters, as a first UL delay parameter to be transmitted to the UE; wherein the RAR message comprises one or more first UL delay parameters, and different first UL delay parameters correspond to different UEs or different UE groups; and, wherein part of MAC subheaders in the MAC header comprise UL delay parameters, and wherein part of MAC subheaders in the MAC header comprise different RAPIDs.

5. The method of claim 2 , wherein, the method further comprises the step of: extracting a second UL delay parameter from an uplink grant in the RAR; and, wherein the step of determining the time to transmit the Msg3 comprises: determining the time to transmit the Msg3 according to the n, the first UL delay parameter and the second UL delay parameter.

6. The method of claim 1 , wherein, when the UE extracts the first UL delay parameter from the downlink control channel information, the step of extracting the first UL delay parameter from the downlink control channel information comprises: extracting a parameter value from a first UL delay field of the downlink control channel information; or extracting, from the downlink control channel information, a UL index value as the first UL delay parameter; or, using a specified bit field for resource allocation in the downlink control channel information as a value of the first UL delay parameter.

7. The method of claim 1 , wherein, at least one of a value of the first UL delay parameter or a value of a second UL delay parameter is a value of a time unit to postpone; or, a parameter correspondence table is preset, and at least one of a value of the first UL delay parameter or a value of the second UL delay parameter is a parameter value corresponding to a value of a time unit to postpone in the parameter correspondence table.

8. The method of claim 1 , wherein, the step of determining the time to transmit the Msg3 comprises: determining according to the n, the first UL delay parameter and a UE's common delay k1; or determining according to the n, the first UL delay parameter, a second UL delay parameter and a UE's common delay k1, wherein a value of the k1 is preset or determined according to system configuration information.

9. A user equipment (UE) in a wireless communication system, the UE comprising: a transceiver; and at least one processor operably coupled to the transceiver, and configured to: receive, from a base station, downlink control channel information and receive an uplink data transmission grant message according to an indication of the downlink control channel information; extract a first UL delay parameter from an MAC header of the uplink data transmission grant message, wherein the first UL delay parameter is a UL delay parameter closest to a random access preamble ID (RAPID) matched with a preamble transmitted by the UE in the MAC header; and determine, according to a time unit index n and the first UL delay parameter, a time to transmit uplink data by the UE; and transmit the uplink data according to the determined transmission time, wherein the n is a time unit index of the uplink data transmission grant message or a time unit index of the downlink control channel information.

10. The UE of claim 9 , wherein, the uplink data transmission grant message is a random access response (RAR) grant message, and the uplink data is an Msg3 in a random access process of the UE.

11. The UE of claim 10 , wherein, when the UE extracts the first UL delay parameter from the downlink control channel information, the at least one processor is further configured to: after the UE detects a downlink control channel by using its own Random Access Radio Network Temporary Identity (RA-RNTI), decide whether an RAR corresponding to the downlink control channel comprises the RAPID matched with the preamble transmitted by the UE itself; if so, extract the first UL delay parameter from this downlink control channel; and if not, continuously detect other downlink control channels until a downlink control channel comprising the RAPID matched with the preamble transmitted by the UE itself is found and extracting the first UL delay parameter from the corresponding downlink control channel; or stop searching and preparing for transmission of a new random access signal according to a higher-layer indication; or continuously search until a random access detection window ends.

12. The UE of claim 10 , wherein, when the UE extracts the first UL delay parameter from the MAC header of the RAR grant message, the at least one processor is further configured to: successively read all MAC subheaders in the MAC header of the RAR message; upon reading the RAPID matched with the preamble transmitted by the UE, use the first UL delay parameter closest to the matched RAPID, among previously read first UL delay parameters, as a first UL delay parameter to be transmitted to the UE; wherein the RAR message comprises one or more first UL delay parameters, and different first UL delay parameters correspond to different UEs or different UE groups; and, wherein part of MAC subheaders in the MAC header comprise UL delay parameters, and wherein part of MAC subheaders in the MAC header comprise different RAPIDs.

13. The UE of claim 10 , wherein the at least one processor is further configured to: extract a second UL delay parameter from an uplink grant in the RAR; and determine the time to transmit the Msg3 according to the n, the first UL delay parameter and the second UL delay parameter.

14. The UE of claim 9 , wherein, when the UE extracts the first UL delay parameter from the downlink control channel information, wherein the at least one processor is further configured to: extract a parameter value from a first UL delay field of the downlink control channel information; or extract, from the downlink control channel information, a UL index value as the first UL delay parameter; or, use a specified bit field for resource allocation in the downlink control channel information as a value of the first UL delay parameter.

15. The UE of claim 9 , wherein, at least one of a value of the first UL delay parameter or a value of a second UL delay parameter is a value of a time unit to postpone; or, a parameter correspondence table is preset, and at least one of the value of the first UL delay parameter or a value of the second UL delay parameter is a parameter value corresponding to a value of a time unit to postpone in the parameter correspondence table.

16. The UE of claim 9 , wherein the at least one processor is further configured to: determine according to the n, the first UL delay parameter and a UE's common delay k1; or determine according to the n, the first UL delay parameter, a second UL delay parameter and a UE's common delay k1, wherein a value of the k1 is preset or determined according to system configuration information.